diff --git a/pkgs/development/python-modules/python-axolotl-curve25519/default.nix b/pkgs/development/python-modules/python-axolotl-curve25519/default.nix
index c7fa9eb4c845..6dfdab632d04 100644
--- a/pkgs/development/python-modules/python-axolotl-curve25519/default.nix
+++ b/pkgs/development/python-modules/python-axolotl-curve25519/default.nix
@@ -3,12 +3,13 @@
   buildPythonPackage,
   fetchPypi,
   fetchpatch,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "python-axolotl-curve25519";
   version = "0.4.1.post2";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
@@ -23,10 +24,12 @@ buildPythonPackage rec {
     })
   ];
 
-  meta = with lib; {
+  build-system = [ setuptools ];
+
+  meta = {
     homepage = "https://github.com/tgalal/python-axolotl-curve25519";
     description = "Curve25519 with ed25519 signatures";
-    maintainers = with maintainers; [ abbradar ];
-    license = licenses.gpl3;
+    maintainers = with lib.maintainers; [ abbradar ];
+    license = lib.licenses.gpl3;
   };
 }